diff --git a/.gitignore b/.gitignore
index bf6addc..54f51fa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -70,6 +70,11 @@ temp/
 # Upstream documentation snapshots (kept as reference, not project source)
 chanora-docs-repo-format-*.zip
 
+# Local vendored-crate experiments. Product dependencies must use
+# crates.io/git dependencies or explicitly committed source with
+# license provenance.
+/third_party/
+
 # Cargo
 **/Cargo.lock.bak